Es muy bueno tener un nativo (Czecho)Eslovaco en nuestro foro, por lo que repito algunas imágenes de la parte 1 aquí con el tipo de descripción, tal como se utiliza hoy en día en documentos.
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Let us start with the continuing confusion about the question: Is this a S.31 or S.131? The S.131 in fact was a modified S.31 to hold the more powerful Pratt & Whitney Hornet and some other minor improvements. According to Dusan this is a trivial question. The official Letov factury documents never mention the S.131. What they mention are S.31 subtypes and for simplicity reasons, these were later relabeled as S.131s.

It is very good to have a native (Czecho)Slovakian in our forum, so I repeat some pictures of part 1 here with the type description as used in nowadays documents.

Abrazotes, Peter.
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So far the Letovs for Spain. And special thanks for all your support, additions, corrections and contributions. That makes it worth to compile these articles.